#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 2e5 + 5;

ll x, y, m, n, L;
ll extgcd(ll a, ll b, ll& x, ll& y) {
  if (b == 0) {
    x = 1, y = 0;
    return a;
  }
  ll d = extgcd(b, a % b, y, x);
  y -= a / b * x;
  return d;
}
int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> x >> y >> m >> n >> L;
  // m * t + x = n * t + y + K * L
  if (m < n) swap(m, n), swap(x, y);
  ll a = m - n, c = y - x;
  ll d = extgcd(a, L, x, y);
  if (c % d) {
    cout << "Impossible";
    return 0;
  }
  c /= d, a /= d, L /= d;
  x = x % L * c % L;
  if (x < 0) x += L;
  cout << x;
  return 0;
}